<template>
    <div class="login_contanier">
        <div class="login_box">
            <!-- 头像区域 -->
            <div class="avator_box">
                <img src="../assets/logo.png" alt="">
            </div>
            <!-- 登陆表单 -->
            <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
                <!-- 用户名 -->
                <el-form-item label="" prop="username">
                    <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
                </el-form-item>
                <!-- 密码 -->
                <el-form-item label="" prop="password">
                    <el-input v-model="loginForm.password" type="password" prefix-icon="iconfont icon-3702mima"></el-input>
                </el-form-item>
                <!-- 按钮 -->
                <el-form-item label="" class="btns">
                    <el-button type="primary" @click="login">登陆</el-button>
                    <el-button type="info" @click="reset">重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>
export default { 
    data () { 
        return { 
            //登陆表单数据绑定信息
            loginForm: { 
                username: 'admin', 
                password: '123456' 
            } ,
            //表单验证
            loginFormRules :{
                //验证用户名是否合法
                username:[
                    { required: true, message: '请输入用户名', trigger: 'blur' },
                    { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                ],
                //验证密码是否合法
                password:[
                    { required: true, message: '请输入密码', trigger: 'blur' },
                    { min: 6, max: 16, message: '密码长度在 6 到 16 个字符', trigger: 'blur' }
                ]
            }
        }
    } ,
    methods:{
        reset:function(){
            //vue组件提供的方法，该表单项进行重置，将其值重置为初始值并删除校正结果
            this.$refs.loginFormRef.resetFields();
            //console.log(this)
        },
        login(){
            //验证表单
            this.$refs.loginFormRef.validate( async valid=>{
                //合法会返回true,否则返回false
               // console.log(valid);
               if(!valid) return;
               const {data:res} = await this.$http.post('login',this.loginForm);
               if(res.meta.status!=200)  return this.$message.error('登录失败');
               this.$message.success('登陆成功')
                // 1.登陆成功后的token,保存到客户端的sessionStirage中
                // 1.1项目中除了登陆之外的其他API接口，必须在登陆之后才能访问
                // 1.2token只应在当前网站打开期间生效，所以将taken保存在sessionStorage
                window.sessionStorage.setItem('token',res.data.token);
                // 2.通过变成是导航跳转到后台主页，路由地址是 /home
                this.$router.push('/home');
            })
        }
    }
}
</script>

<style lang="less" scoped>
.login_contanier{
    background-color: #2b4b6b;
    width: 100%;
    height: 100%;
}
.login_box{
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
    .avator_box{
        width: 130px;
        height: 130px;
        border:1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px  #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%,-50%);
        background-color: #fff;
        img{
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }
}
.btns{
    display: flex;
    justify-content: flex-end;
}
.login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 10px;
    box-sizing: border-box;
}
</style>
